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Prepare for the timed AP Chemistry test.

Your answers are held until submission. The final review identifies the units that need another pass.

AP Chemistry coverage and review map

Connect every question to the exact skill it rehearses. Work through the units in order, then return to any topic that still needs a hint or a second attempt.

01

Atomic Structure and Properties

Moles, spectra, electron configuration, periodic trends

Goal: recognise a atomic structure and properties problem from its wording, carry out the governing method, and check that the result is reasonable.

02

Compound Structure and Properties

Bonding, Lewis structures, forces

Goal: recognise a compound structure and properties problem from its wording, carry out the governing method, and check that the result is reasonable.

03

Properties of Substances and Mixtures

Intermolecular forces, solutions, spectroscopy

Goal: recognise a properties of substances and mixtures problem from its wording, carry out the governing method, and check that the result is reasonable.

04

Chemical Reactions

Equations, stoichiometry, titration

Goal: recognise a chemical reactions problem from its wording, carry out the governing method, and check that the result is reasonable.

05

Kinetics

Rate laws, mechanisms, activation energy

Goal: recognise a kinetics problem from its wording, carry out the governing method, and check that the result is reasonable.

06

Thermochemistry

Energy, calorimetry, enthalpy

Goal: recognise a thermochemistry problem from its wording, carry out the governing method, and check that the result is reasonable.

07

Equilibrium

K, Q, Le Châtelier, solubility

Goal: recognise a equilibrium problem from its wording, carry out the governing method, and check that the result is reasonable.

08

Acids and Bases

pH, buffers, titration, structure

Goal: recognise a acids and bases problem from its wording, carry out the governing method, and check that the result is reasonable.

09

Thermodynamics and Electrochemistry

Entropy, Gibbs energy, cells

Goal: recognise a thermodynamics and electrochemistry problem from its wording, carry out the governing method, and check that the result is reasonable.

AP Chemistry questions with worked answers

These 8 questions are printed in full on this page and are drawn across 8 of the 9 course units. Nothing here is generated on the fly. Cover the options, solve each one on paper, and only then open the worked answer to compare your method with the one shown.

Question 1: An element has two isotopes: 75% with mass 35 and 25% with mass 37. What is the average atomic mass?

AP Chemistry · Atomic Structure and Properties

  1. 35.5
  2. 36.0
  3. 36.5
  4. 35.0
Show the worked answer
  1. Multiply each isotope mass by its share of the sample.
  2. 0.75 x 35 = 26.25.
  3. 0.25 x 37 = 9.25.
  4. 26.25 + 9.25 = 35.5. The answer sits closer to 35 because that isotope is more common.

Answer: 35.5

Question 2: What is the molarity of a solution made from 0.5 mol of solute in 250 mL of solution?

AP Chemistry · Properties of Substances and Mixtures

  1. 2.0 M
  2. 0.5 M
  3. 0.125 M
  4. 125 M
Show the worked answer
  1. Molarity is moles of solute per liter of solution.
  2. Convert the volume: 250 mL = 0.250 L.
  3. 0.5 / 0.250 = 2.0.
  4. So the solution is 2.0 M.

Answer: 2.0 M

Question 3: For 2 H2 + O2 gives 2 H2O, you start with 3 mol H2 and 2 mol O2. How much water forms?

AP Chemistry · Chemical Reactions

  1. 3 mol
  2. 2 mol
  3. 4 mol
  4. 5 mol
Show the worked answer
  1. The equation needs 2 mol H2 for every 1 mol O2.
  2. 3 mol H2 would pair with only 1.5 mol O2, and 2 mol O2 are available, so hydrogen runs out first.
  3. Hydrogen is the limiting reactant.
  4. The ratio of H2 to H2O is 2 to 2, so 3 mol H2 makes 3 mol of water.

Answer: 3 mol

Question 4: A first-order reaction has a half-life of 20 minutes. What fraction of the reactant remains after 60 minutes?

AP Chemistry · Kinetics

  1. 1/8
  2. 1/3
  3. 1/6
  4. 1/4
Show the worked answer
  1. For a first-order reaction the half-life does not depend on concentration.
  2. 60 minutes is 60 / 20 = 3 half-lives.
  3. Each half-life leaves half of what was there: 1/2, then 1/4, then 1/8.
  4. So 1/8 of the reactant remains.

Answer: 1/8

Question 5: How much heat is absorbed when 50.0 g of water warms by 20.0 degrees Celsius? Use c = 4.18 J per g per degree.

AP Chemistry · Thermochemistry

  1. 4,180 J
  2. 418 J
  3. 1,045 J
  4. 41,800 J
Show the worked answer
  1. Use q = m c times the change in temperature.
  2. 50.0 x 4.18 = 209 J per degree.
  3. 209 x 20.0 = 4,180.
  4. So the water absorbs 4,180 J, or about 4.18 kJ.

Answer: 4,180 J

Question 6: For A in equilibrium with B, Kc = 4.0. Starting from 1.0 M A and no B, what is the equilibrium concentration of B?

AP Chemistry · Equilibrium

  1. 0.80 M
  2. 0.20 M
  3. 0.50 M
  4. 4.0 M
Show the worked answer
  1. Let x be the amount of A that converts, so at equilibrium B is x and A is 1 - x.
  2. The equilibrium expression is x / (1 - x) = 4.0.
  3. Multiply out: x = 4 - 4x, so 5x = 4.
  4. x = 0.80, so B is 0.80 M and A is 0.20 M.

Answer: 0.80 M

Question 7: What are the pH and pOH of a 0.010 M solution of HCl at 25 degrees Celsius?

AP Chemistry · Acids and Bases

  1. pH 2.00 and pOH 12.00
  2. pH 12.00 and pOH 2.00
  3. pH 1.00 and pOH 13.00
  4. pH 0.010 and pOH 13.99
Show the worked answer
  1. HCl is a strong acid, so it fully ionizes and the hydrogen ion concentration is 0.010 M.
  2. pH is the negative log of that: the log of 0.010 is -2, so pH = 2.00.
  3. At 25 degrees Celsius, pH + pOH = 14.00.
  4. 14.00 - 2.00 = 12.00, so pOH = 12.00.

Answer: pH 2.00 and pOH 12.00

Question 8: A reaction has a change in enthalpy of +50 kJ and a change in entropy of +0.10 kJ/K. Is it spontaneous at 300 K?

AP Chemistry · Thermodynamics and Electrochemistry

  1. No, because the free energy change is +20 kJ
  2. Yes, because the free energy change is -20 kJ
  3. Yes, because entropy increases
  4. No, because the free energy change is +80 kJ
Show the worked answer
  1. Use the free energy equation: change in G equals change in H minus T times change in S.
  2. T times the entropy change is 300 x 0.10 = 30 kJ.
  3. 50 - 30 = 20 kJ.
  4. A positive free energy change means the reaction is not spontaneous at 300 K, though it would be above 500 K.

Answer: No, because the free energy change is +20 kJ

Which unit each printed question belongs to

Use this map after marking your work. If two misses share a unit, review that unit before starting a generated set.

The 8 printed AP Chemistry questions, the unit each one tests, and its answer.
QuestionUnitWhat it asksAnswer
1Atomic Structure and PropertiesAn element has two isotopes: 75% with mass 35 and 25% with mass 37. What is the average atomic mass?35.5
2Properties of Substances and MixturesWhat is the molarity of a solution made from 0.5 mol of solute in 250 mL of solution?2.0 M
3Chemical ReactionsFor 2 H2 + O2 gives 2 H2O, you start with 3 mol H2 and 2 mol O2. How much water forms?3 mol
4KineticsA first-order reaction has a half-life of 20 minutes. What fraction of the reactant remains after 60 minutes?1/8
5ThermochemistryHow much heat is absorbed when 50.0 g of water warms by 20.0 degrees Celsius? Use c = 4.18 J per g per degree.4,180 J
6EquilibriumFor A in equilibrium with B, Kc = 4.0. Starting from 1.0 M A and no B, what is the equilibrium concentration of B?0.80 M
7Acids and BasesWhat are the pH and pOH of a 0.010 M solution of HCl at 25 degrees Celsius?pH 2.00 and pOH 12.00
8Thermodynamics and ElectrochemistryA reaction has a change in enthalpy of +50 kJ and a change in entropy of +0.10 kJ/K. Is it spontaneous at 300 K?No, because the free energy change is +20 kJ

How the generated AP Chemistry sets are created

The 8 questions above are fixed and checked. The generator at the top of the page is different: it writes fresh questions with AI from the course and unit information shown here, then the application checks each one for a complete prompt, four choices, one keyed answer, and an explanation. Generated questions are original practice—not official or released exam questions—and AI can still make mathematical mistakes. Verify a disputed answer with the stated method, your course materials, or the MathGPT solver, and follow the site's academic-integrity guidance.

Questions about this AP Chemistry course test

What does this page cover?

It covers all 9 AP Chemistry units listed above.

When can I see correct answers and explanations?

Submit the full test first. The result screen then shows every response, the correct answer, and the explanation so you can review each miss.

How long is each section of the AP Chemistry exam?

Multiple choice: 1 hour 30 minutes, 60 questions. Free response: 1 hour 45 minutes, 7 questions.

Which AP Chemistry sections allow a graphing calculator?

Rules change from section to section. Multiple choice: no calculator. Free response: scientific or graphing calculator. Provided for the whole exam: periodic table and equations and constants sheet. Practise each section under its own rule.

Which AP Chemistry units does this test cover?

All nine: Atomic Structure and Properties, Compound Structure and Properties, Properties of Substances and Mixtures, Chemical Reactions, Kinetics, Thermochemistry, Equilibrium, Acids and Bases, Thermodynamics and Electrochemistry. Study first: Properties of Substances and Mixtures (18–22%) carries the largest published weighting.

What should I check first when I review a missed AP Chemistry question?

Significant figures are graded on free-response calculations. Carry extra digits through and round once at the end.

What should I do with a missed question?

Classify the miss as a definition, setup, calculation, interpretation, or timing error. Re-solve it from a blank page, then use the MathGPT tutor for a hint or method check.